The first framework agreement with the Université Libre de Bruxelles (ULB) was signed in 1991. UNIL's collaborative relationships in research with ULB, which have always been intense, and the high level of student mobility between the two institutions naturally led to the signing of a privileged partnership agreement in 2016. Regular meetings are planned to identify and develop new areas for collaboration (funds for the promotion of research projects, doctoral study days, collaboration between departments, etc.).